This study dealt with " Zawa'id Musnad al-Rubaie ibn Habib on the two Sahih-a critical study-the book of prayer as a model." It was divided into three chapters and a conclusion. The introduction dealt with the principle of Imam al-Rubaie and the two Sahihs and the definition of al-Zawa'id in general. The first and second chapters included the al-Zawa'id related to the two Sahih, and varied between a total Zawa'id, or another narration of another companion, or with increase in influential words. It was revealed to me through the study that the total hadiths reached (135), and through the other companion (127), and the difference in the words of influence reached (59). As for the hadiths of the study; it was in the Book of Prayer, and it was studied and authenticated, and the true and weak ones were mentioned by non-Imam Al-Rabee in the second chapter. The additional hadiths are (32),30 of which are true, In the last chapter, there was exposure to Maraseel, Mongatiat and Mothilat on the two sahih, which Imam al-Salami referred as being in the mutasil. The total number of Mongatiat in general reached 94 hadiths, including of Imam Jaber bin Zayd, (35) and Abu Ubaida Monqatiat (26) hadiths and finally the Mothilat of Abu Ubaida and al-Rubaie (33) hadiths.